求助 GWD9-3

GWD9-3

Scientists have made genetic modifications to cotton to increase its resistance to insect pests. According to farmers’ report, the amount of insecticide needed per acre to control insect pests was only slightly lower for those who tried the modified seed than for those who did not. Therefore, since the modified seed costs more than ordinary seed without producing yields of higher market value, switching to the modified seed would be unlikely to benefit most cotton farmers economically.

Which of the following would it be most useful to know in order to evaluate the argument?

A. Whether farmers who tried the modified cotton seed had ever tried growing other crops from genetically modified seed.
B. Whether the insecticides typically used on ordinary cotton tend to be more expensive than insecticides typically used on other crops.
C. Whether for most farms who grow cotton it is their primary crop
D. Whether the farmers who have tried the modified speed planted as many acres of cotton, on average, as farmers using the ordinary seed did.
E. Whether most of the farmers who tried the modified seed did so because they had previously had to use exceptionally large quantities of insecticide.

答案是D，

谁能解释下D是什么意思，为什么对啊？

我选的是B，个人感觉，只有B和经济价格相关，谢谢

这道题选E

这道题的意思是用modified seed 和ordinary seed 在 the amount of insecticide 上只是少了一点点

可是价钱又贵很多  yields 没见长

所以从经济角度还不如用ordinary seed 来的划算

B选项完全是irrelevant 这里是就cotton论cotton 论用在cotton这种crop 上两种选择的性价比谁高  other crops无关

而E说这批农民用在modified seed 上的农药是否过多

这直接导致这个问题是否要重新考虑

如果是

就说明选择modified seed 不一定会更不划算